This patch makes the w83781d driver preserve fan_min settings when theuser changes fan_divs. This isn't done "by default" because the actualfan min value (in RPMs) depends on both the fan_min register and thefan_div register. Only two drivers handle it properly at the moment asfar as I know (lm78 and asb100). Several other drivers would need to befixed the same way, but well, once at a time ;)

Tested on my AS99127F rev.1.

Credits go to Philip Pokorny, since I think I remember he is the one whointroduced the method in the lm78 driver in the first place.

This tends to increase the size of the three set_store_regs_fan_divfunctions, and I am considering refactoring them at some point. Laterthough.